[RFC PATCH v2 0/2] RISC-V: __builtin_riscv_pause for all environment

[Tsukasa OI <research_trasio@irq.a4lg.com>]

**WARNING**

Following patch sets are exclusive:

1.  [RFC PATCH v2] RISC-V: __builtin_riscv_pause for all environment (this)
2.  [RFC PATCH] RISC-V: Make __builtin_riscv_pause 'Zihintpause' only

See <https://gcc.gnu.org/pipermail/gcc-patches/2023-August/626748.html>
for the background of this patch set.


Changes: v1 -> v2

*   Improve test case to test both RV32 and RV64 (+'Zihintpause').


Comparison: Patch sets [1] (this) and [2]

*   [1] completely preserves the compatibility with GCC 13
    ([2] removes __builtin_riscv_pause if the 'Zihintpause' extension is
     absent, making a minor compatibility issue)
*   Because of the nature of the instrinsic, [2] is more natural
    ("pause" is defined in the 'Zihintpause' extension).


Please consider those patch sets and decide which to apply.

Sincerely,
Tsukasa




Tsukasa OI (2):
  RISC-V: __builtin_riscv_pause for all environment
  RISC-V: Fix documentation of __builtin_riscv_pause

 gcc/common/config/riscv/riscv-common.cc             |  2 ++
 gcc/config/riscv/riscv-builtins.cc                  |  6 ++++--
 gcc/config/riscv/riscv-opts.h                       |  2 ++
 gcc/config/riscv/riscv.md                           |  7 ++++++-
 gcc/doc/extend.texi                                 |  6 +++---
 gcc/testsuite/gcc.target/riscv/builtin_pause.c      | 10 ----------
 gcc/testsuite/gcc.target/riscv/zihintpause-1.c      | 11 +++++++++++
 gcc/testsuite/gcc.target/riscv/zihintpause-2.c      | 11 +++++++++++
 gcc/testsuite/gcc.target/riscv/zihintpause-noarch.c | 12 ++++++++++++
 9 files changed, 51 insertions(+), 16 deletions(-)
 delete mode 100644 gcc/testsuite/gcc.target/riscv/builtin_pause.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/zihintpause-1.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/zihintpause-2.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/zihintpause-noarch.c


base-commit: 9b099a83b45b8fcdfc07d518e05d36ea741b2227
-- 
2.41.0